Much of the invasion below might seem quite uninteresting.
This is so because I had the idea to try to track down all naval movements in Oslofjord
during the 9th to 11th April, thus I have gathered a lot of info on minor events, and I
havent had heart to cut out anything from the list.

Observe that Norwegian time is used. To get German time add
one hour.Dates are given as [day #]/[month #], i e the 9th of April is 9/4.

date

time

end time

event

position

2/4

The time for Weserübung (the invasion) is fixed to
9th April.

3/4

The first transports leaves German ports.

8/4

02:00

Group 5, of the Kriegschiff staffel, sails from the
bay of Kiel, with the mission to take the forts and naval bases in Oslofjord, and occupy
Oslo.

Kiel

8/4

Group 5 is attacked by submarine outside Skagen. No
hit

outside Skagen

8/4

22:20

Radio messsage from Oslo Radio that all lighthouses
shall be turned off, by order from commander in chief of the Navy. The order was however
not executed.

8/4

23:00

Group 5 and PolIII, a Norwegian patrol vessel at the
outer guard line of Oslofjord fortress area, sights each other. The Torpedo Boat (light
destroyer) Albatros is dispatched to deal withthe Norwegian vessel. By mistake Pol III
rams Albatros.

Norwegian patrol vessel Farm, also at the outer guard
line of Oslofjord fortress area, sights unidentified ships and sends message

outer Oslofjord

8/4

23:15

Admiral staff gets the message from Farm

Oslo

8/4

23:15

Pol III fires larmrocket. Then Pol III ges up side by
side with Albatros and there is a short conversation between the commanders. The ships
separates again and suddenly Albatros opens fire on Pol III. The commander is wounded, and
drowns when the the crew leaves the boat. The first Norwegian causalty of the invasion.

outer Oslofjord

8/4

23:15

Fog is coming in

Oslofjord

8/4

23:20

Alarm on Rauøy fort

Rauøy

8/4

23:25

Norwegian patrol vessel Kjæk sights a ship and fires
a rocket

8/4

23:28

Rauøy is battle ready. Searchlights are lit.

Rauøy

8/4

23:30

Rauøy sights two big warships about 4 km west S
Misingen

Rauøy

8/4

23:30

Warning shot with blank round is fired from Rauøy

Rauøy

8/4

23:30

Alarm on Bolærne

Bolærne

8/4

23:32

Warning shot with live ammunition is fired in front of
the ships, from Rauøy

Rauøy

8/4

23:36

23:43

4 rounds fire for effect from Søndre batteri on
Rauøy, which however falls very short of target.

Rauøy

8/4

23:37

Bolærne is battle ready

Bolærne

8/4

23:40

Warning shot with blank round is fired from Bolærne

Bolærne

8/4

23:40

The fog gets denser

Oslofjord

8/4

23:50

Battle readiness is ordered on Oscarsborg fortress

Oscarsborg

9/4

00:12

Order to 1.Sjøforsvarsdist. from Commanding Admiral
to lay preplanned mine barrage Rauer-Bolærne as soon as possible

Oslo-Horten

9/4

00:30

1.Flyavd ordered to evacuate from Horten to Drøbak

Horten

9/4

01:00

02:30

All airplanes in Horten are evacuated to Drøbak

Horten

9/4

01:00

The British marine attach, Adm H Boyes, visits
the Chief of Admiral staff in Oslo and is informed that there are no mines in Oslofjord

Oslo

9/4

01:30

Order about minelaying is recalled by Commanding
Admiral as the British fleet is expected

Oslo-Horten

9/4

02:00

Otra ready to sail

Horten

9/4

02:00

Alpha arrives to Filtvet to supplement Furu

Filtvet

9/4

02:00

90 men from Emden embarked on R20 and R24, with the
mission to take Rauøy fort.

Oslofjord

9/4

02:15

Olaf Tryggvason at position at the entrance to Horten
harbour

Horten

9/4

02:30

Main force of Group.5 continues north with slow speed

Oslofjord

9/4

02:30

Landing parties are transferred from Emden to
minesweepers in the area Horten - Filtvet

Oslofjord

9/4

02:30

Otra leaves Horten

Horten

9/4

03:00

1.Mineleggerdiv (minelayer unit) is loaded with mines
and ready

9/4

03:38

Filtvet, at the outer end of the narrows leading to
Oscarsborg and Oslo, reports that warships are passing

Filtvet

9/4

04:00

1.Mineleggerdivision () is ordered to Jersøy

9/4

04:00

1.Submarine division (A2, A3, A4) leaves Teie

Teie

9/4

04:00

R20 and R24 stops in Engelsviken to find out where
they are (they were lost in the fog)

Engelsviken

9/4

04:00

Report to Rauøy fort that foregin soliders had been
in Engelsvik asking about Rauøy fort

Rauøy fort

9/4

04:10

Otra reports the presence of a destroyer and two
minesweepers, and that they are German. This is the first indication of Nationality that
the Norwegian command gets.

outside Horten

9/4

04:21

The main battery of Oscarsborg opens fire on Blücher
at a distancce of 1800 m, scoring two hits. The secondary batteries (15 cm) also opens
fire, scoring multiple hits. The return fire is unable to make any damage.

Oscarsborg

9/4

04:30

Rauøy fort asks I.R.1 in Fredrikstad for an infantry
company. I.R.1 has no troops available

Rauøy fort

9/4

04:35

R17 and R27 enters the bay containing Horten harbour.
Albatros and Kondor stays outside, north of the inlet. After first assuming it was
Norwegian boats and then firing warning rounds, Olaf Tryggvason fires at R17 and hits it
when it has reached the quay, setting it on fire. R27 gets into a duel with Rauma, where
both boats takes hits, and Rauma has to withdraw.

Horten

9/4

04:54

Norwegian merchant M/S Sørland is shot on fire by a
German minesweeper south of Oscarsborg. The Norwegians thinks the burning ship is a German
warship (Brummer).

inner Oslofjord

9/4

05:00

1.Mineleggerdivision in position outside Jersøy

9/4

05:05

Message about German landing at Vallø.
Oter I leaves from Tønsberg for Vallø.

4. Gardeskp. leaves their barraks for Digerud with the
order to disarm the survivors from Blücher.

Oslo

9/4

12:00

Areal bombing of Oscarsborg pauses while Lützow takes the fort under fire from a distance of 16-17000m.

Oscarsborg

9/4

13:00

Bombing of Oscarsborg is resumed. The anti aircraft
artillery is silenced. The bombing is directed mainly at Söndre (south) Kaholmen. There
are no losses due to the bombing but the morale wavers. The communication link between
Kaholmen, with the HQ and the main battery, and the mainland with the Kopås battery, is
broken.

Oscarsborg

9/4

16:30

The bombing of Oscarsborg decreases and German ships
approaches, but stops at 9000m (Halvorshamn). The Kopås battery is manned, but not the
main battery as the crews are dispersed and demoralized. The commander discusses the
apearant futility of further resistance with his subordinates.

Oscarsborg

9/4

17:15

Order from the commander at Oscarsborg to the Kopås
battery not to open fire without explicit order. The order is given with optical signals
due to the broken telephone link.

Oscarsborg

9/4

18:00

The bombing of Oscarsborg ceases. A German torpedo
boat (Kondor) and a couple of smaller boats are observed as the begin to land troops in
Dröbak (at Tollbodbrygga). The Kopås battery is silent due to the previous order.

Oscarsborg

9/4

18:15

The Husvik battery informs the Kopås battery that
they are occupied by Germans.

Oscarsborg

9/4

18:25

The Kopås battery informs Kaholmen that they are
occupied. Kondor approaches Kaholmen with parlimentary flag.

Oscarsborg

9/4

18:30

Surrender negotiations are initiated on Kondor, and
later on Kaholmen. During the night Kondor and a raumboot (minesweeper) passes Oscarsborg,
to pick up survivors from Blücher. Oscarsborg is still not occupied and there is no
formal surrender, but the commander has given his word of honor that the ships wont be
fired upon.

Oscarsborg

10/4

07:20

Bolærne fires three warning shot against transport
ship coming from south, the ship turns south

Bolærne

10/4

ca 7.30

???

Bolærne is bombed. No damage.

Bolærne

10/4

09:00

Surreder of Oscarsborg is agreed upon. The German flag
is raised. Due to the unusual agreement the Norwegian flag will still be raised also, and
Norwegian officers will keep their arms. Lützow and Emden passes

Oscarsborg

10/4

10:45

Lützow and Emden reaches Oslo

Oslo

10/4

Albatross and two armed trawlers approach Bolærne
from north. Bolærne opens fire at 8000 m (10-12 shot, no hits) and the Germans turn
north. The Norwegian guns are damaged though, due to erronous handling.

Bolærne

10/4

Albatross runs aground (and is not possible to save)

Bolærne

10/4

all morning

Bolærne is bombed and strafed repeatedly. One killed,
no damage on batteries. White flag is raised on Bolærne by demoralized privates

Bolærne

10/4

Weapon smith reports that only one of the 15cm guns is
in (limited) working condition.

Bolærne

10/4

Commander of Bolærne, Maj Færden, decides to make no
opposition against any German approach. The white flag is left raised.